Yarn tension device



Paiented May 199, 942

any?

assess? (Cit iii-2 15i) 4 Gianna This invention relates to a yarn tension device and refers more particularly to a yarn brake or yarn control whlchis used in various types of textile machines, for instance, for supporting yarns on their way from bobbins to the beam of a warping machine.

An object of the present invention is the provision of a yarn tension device which can be easily and conveniently adjusted to yarns of dif ferent sizes, and which will operate with the same efiiciency with yarns of any normal size.

Another object is to provide a single yarn tension device which can be used satisfactorily for tensioning yarns of different sizes ranging from forty-five deniers to one-hundred deniers, and more.

A further object is the provision of a yarn tension device the pressure of. which upon the yarn may be varied from zero to a maximum.

Other objects of the present invention will become apparent in the course of the following specification.

In accomplishing the objects of the present invention, it was found advisable to provide a yarn tension device having a pivoted member and an adjacent stationary member, each of these members being provided with a plurality of gripping elements cooperating to form a braking passage for the yarn, the pivoted member being provided with a weight support which may cooperate with a vibration-dampening dash-pot arrangement and which is located on both sides of the pivot of the pivoted member. v

The center of gravity of the pivoted member is usually situated between its pivotand the stationary member, so that the gripping elements of the pivoted member have the tendency to swing toward the gripping elements of the stationary member. By utilizing a support having ends extending on both sides of the pivot and by applying weights to any one oi these ends,

the center of gravity of the pivoted member may i be shifted either toward or awayfrom the stationary member and, in an extreme case, it may be even placed in'a vertical plane extending through the pivot. Thus, by hanging weights at different ends of the support, the amount oi pressure exerted upon the yarn by the gripping elements of the pivoted member may be varied from zero to any desired maximum, and this makes it possible to utilize the same tension device for yarns of any size.

' The invention. will appear more clearly from the following detailed description when taken in connection with the accompanying drawing showing, by way of example, a preferred embodiment of the inventive idea.

In the drawing:

Figure l is a top view of a yarn tension device constructed in accordance with the principles of the present invention.

Figure 2 is a front view of the tension device shownin Figure l.

Figure 3* is .a section along the lines 8-3 of Figure 1; and

Figure 4 is a fragmentary perspective view illustrating the weight support.

The yarn tension device shown in the drawing comprises a stationary member 5, a pivoted member a and a support 9. The support 9 may be made of metal, while the members 5 and a may be made of porcelain. The tension device is mounted upon a rod or holder 1 extending through a passage 8 provided in the support 9. A screw it is carried by an extension it comstituting a part of the support 9. The screw it may project into the passage 8 and is used for holding the tension device firmly upon the rod i.

The support 9* contains a cylindrical chamber 12 constituting apart of a dash pct 83 which includes a piston is reciprocable within the chamber 52 and carrying a piston "rod It.

A curved yarn guide it may be connected with the support 9 by a suitable layer ii. The passage as for the yarn, which is provided in the guide it, has a wider inlet l8 and a narrower outlet is. The yarn emerges out of the outlet it at right angles to its direction at the inlet i8, and is then led through openings 2! provided in the gripping elements 22 to El constituting a part of the stationary member 5.

As shown in Figures 1 and 3, each of the gripping eleriients 22 to 2? has the-form of an arm provided with an opening 25 close to its outer end, all of the openings 25 extending in alinement with each other. A plate 28 which carries the gripping elements 22 to El and which may be integral therewith, is connected by a bolt 2%; with a supporting plate it constituting a part of the support d.

The plate 3% is provided with arms 30 and 32 serving as brackets or supports for the pivot bar 33 carrying the pivoted member 5.

The pivoted member s is provided with gripping elements it to 3d which are situated be; tween the gripping elements 22 to 2? of the stationary member As shown in Figure 3, each of the gripping elements it to 35 of the pivoted member 6 has the form of an upwardly directed hook provided with a curved surface 39, the po- 6 is mounted upon the pivot bar 33. The heaviest portion Ill of the pivoted member 6 is situated between the pivot bar 33 and the plate 28 of the stationary member 5. Dueto this position of the center of gravity of the pivoted member 5,

I the gripping elements M to 38 have the tendency to swing downwardly in a direction toward the plate 28.- Thus the gripping elements 34' to 38 assays? tend to reduce the free operative area of the openings 2i and to exert pressure upon a yarn extending through these penings The pivot-bar 33 is so constructed that it canbe conveniently used as a carrier or support of weights, through theuse of which the pressure exerted bythe gripping elements 36 to 38 upon the yarn may be varied from zero to a maximum. This is attained by extending the pivot bar 33 in the form of a hook 52 having an adjacent weight-supporting'portion 53 (Fig. 4). Acontinuation of the pivot bar 33 is bent in the form of a rod t l extending at right angles to the original direction of the pivot bar 38 and having a projecting end 35. The weight-supporting portion t3 is limited by the hook'M and the projection i5.

The opposite end of the rod M is connected with the piston rod l5 oi the dash-pot l3 and extends through a slot il formed in the support 9; it has the' form of a weight-supporting hook it.

The pivot bar 33 is provided, therefore, with two weight-supporting portions 43 and 46. The

yarn is unwound from a bobbin (not shown) and enters the'inlet It or the passage It; provided in the guide it. The direction or the yarn at the inlet l8-is at right angles to its direction at the outlet l9, so that the yarn is somewhat stretched in the guide it which is sufliciently long to prevent the balloon of the yarn from being entangled with the brake. The yarn emerging from the outlet is passesthrough the openings 2! or the gripping elements 22 to 2'8 and is tensioned by the gripping elements 3% to 38. As already stated,

the pressure of the gripping elements. 3 3 to Be has been set in advance depending upon the size of the yarn and may vary from zero to any desired maximum. The oscillations of the pivoted member 6, resulting from the speed oi movement of the yarn, are dampened by the dash-pot it. The yarn leaving the yarn tension device is warped on the beam of a warping or beaming machine (not shown) i It is apparent that the specific example shown above has been given by way of illustration and not by way or limitation and that the structures above described are subject to wide variation and modification without departing from the scope or intent of the invention, all of which variations and modifications are to be included within the scope' of the present invention.

What is claimed is: I o l. A yarn tension device, bination, immovable gripping elements, an clongated pivot bar, a supporting bodymounted upon portion 46 is situated upon that side of the pivot or axis of the pivoted member 6, which is closer to the stationary member 5, whilethe portion #33 is situated upon the opposite .side of the pivot (Fig. 3)

Therefore, a weight or weights t? placed over the hook, will shift the center of gravity of the pivoted member 6 further toward theplate 28 and will increase the pressure of the gripping elements 36 to 38 upon the yarn extending through the openings 2|. On the other hand, if

- the weight or weights 4? were removed from the hook 66, and a weight or weights it were placed over the hook 42 upon the weight-supporting portion 63, the center of gravity of the pivoted member 6 would be shifted in the opposite direction, namely, toward the pivot or the axis of rotation of the pivoted member 6, thereby diminishing the pressure of the gripping elements 3 5 to 38 upon the yarn. By placing a'lighter weight 4'! upon the hook t6 and a heavier weight 58 upon the weight-supporting portion 43 (Fig.4), the pressure of the gripping elements 34 to 38 may be slightly decreased. 7

In general, it is apparentthat by suitably sethem in difierent combinations upon the weightsupporting portions 63 and/or 46, the pressure of the gripping elements may be set at any desired quantity ranging from zero to amaximum, the value of which is determined solely by constructional limitations of the yarn tension device.

said pivot bar and rotatable therewith, and

swingable gripping elements carried by said supporting body and cooperating with said immovable gripping elements to r'orma braking passage for the yarn, said supporting body and said swingable elements constituting a pivoted member having a center of gravity normally situated between the pivot bar and the immovable gripping elements, so that it tends to swing said swingable gripping elements toward said immovable gripping elements and to exert pressure upon the yarn; said pivot bar having an extension portion extending on both sides thereof and'constituting supports for weights varying the position of said center of gravity.

bination, immovable gripping elements, an elongated rod constituting a pivot bar, a supporting.

body mounted upon said pivot bar and rotatable therewith, and swingable gripping elements carlecting the weights 41 and G8, and by hanging riedv by said supporting body and cooperating with said immovable gripping elements to form a braking passage for the yarn, said supporting body and said swingable elements constituting a pivoted member having a center of gravity normally situated between the pivot bar and the immovable gripping elements, so that it tends to swing said swingable gripping elements toward said immovable gripping elements and to exert pressure upon the yarn; said elongated pivot bar having a continuation forming two weight-supporting portions situated on opposite sides of the pivot bar for varying the position of said center of gravity.

'3. A yarn, tension device, comprising, in combination, immovable gripping elements, an elongated rod constituting a pivot bar, a supporting body mounted upon said pivot bar and rotatable therewith, and swingable gripping elements carried by said supporting body and cooperatingwith said immovable gripping elements to form a braking passage for the yarn, said supporting body and said swingable elements constituting a comprising, in 'commally situated between the pivot bar and the immovable gripping elements, so'that it tends to swing said swingable gripping elements toward said immovable gripping elements and to exert pressure upon the yarn; said elongated pivot bar having a continuation comprising a hook, a rod extending atright angles to the pivot bar and having a projecting end, and a weight-support ing portion situated upon one side of the pivot bar and extending between said hook and said projecting end, the other end of said rod having the form of a weight-supporting hook extending upon the opposite side oi the pivot bar.

4. A yarn tension device, comprising, in com- 'bination, a support having a dash-pot, a guide connected with said support and having'a passage formed therein, said passage having an inlet and an outlet extending at right angles to each other, a stationary member connected with said support and having immovable gripping elements having openings formed therein for the yarn, said openings being in alinement with each other and adapted to receive the yarn emerging from said outlet, an elongated rod constituting a pivot bar,

a supporting body mounted upon said pivot and rotatable therewith, and swingable gripping elements carried by said supporting body and having surfaces situated in alinement with said open ings and cooperating with said immovable gripping elements to form a braking passage for the yarn, said supporting body and said swingable elements constituting a pivoted member having a center of gravity normally situated between the pivot bar and the immovable gripping elements, so that it tends to swing said swingable gripping elements toward'said immovable gripping elements and to exert pressure upon the yarn; said elongated pivot bar having a continuation comprising a hook, a rod extending at right angles to the pivot bar and having aprojecting end, and a weight-supporting portion situated upon one side oi the pivot bar and extending between said hook and said projecting end, the other end of said rod having the form of a weight-supporting hook extending upon the opposite side of the pivot bar, and connected with said dash-pot.

AUGUST K. SCHOENENBERG. 

